30,367 results match your criteria Organic Solvents


Key Intermediate in Copper-Mediated Arene Trifluoromethylation [nBu4N][Cu(Ar)(CF3)3]: Synthesis, Characterization and C(sp2)-CF3 Reductive Elimination.

Angew Chem Int Ed Engl 2019 Apr 20. Epub 2019 Apr 20.

Shanghai Institute of Organic Chemistry, Key Laboratory of Organofluorine Chemsitry, 345 Lingling Road, 200032, Shanghai, CHINA.

The synthesis, characterization and C(sp2)-CF3 reductive elimination of stable aryl(tris(trifluoromethyl))cuprate(III) complexes [nBu4N][Cu(Ar)(CF3)3] were described. Mechanistic investigations including kinetic studies, the effect of temperature and solvents, the effect of the para-substitution of the aryl group and DFT calculations suggest that C(sp2)-CF3 reductive elimination process proceeds via a concerted carbon-carbon bond-forming pathway. Read More

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http://dx.doi.org/10.1002/anie.201904041DOI Listing

Two-component cross-linkable gels for fabrication of solid oral dosage forms.

J Control Release 2019 Apr 16. Epub 2019 Apr 16.

Faculty of Biotechnology and Food Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel; Russell Berrie Nanotechnology Institute, Technion - Israel Institute of Technology, Haifa 3200003, Israel.

Current three-dimensional (3D) printing techniques involve the solidification of the injected materials by means of UV irradiation, evaporation of organic solvents, or harsh heating and cooling processes. These methods limit the printing of many sensitive bio-active molecules such as proteins. We describe a novel 3D printing technique based on two complementary liquid copolymers, PEG-PCL-SC and PEG-PCL-NH, that are injected in a coordinated fashion and react with each other to form a pre-designed 3D pill. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S01683659193022
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http://dx.doi.org/10.1016/j.jconrel.2019.04.021DOI Listing
April 2019
1 Read

Improving Homogeneous Cationic Gold Catalysis through a Mechanism-Based Approach.

Acc Chem Res 2019 Apr 19. Epub 2019 Apr 19.

Key Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology , Donghua University , Shanghai 201620 , China.

Homogeneous gold catalysis is regarded as a landmark addition to the field of organic synthesis. It is the most effective way to activate alkynes for the addition of a diverse host of nucleophiles. However, the literature reveals that a relatively high catalyst loading is needed in many gold-catalyzed applications (1-10 mol %), which is impractical in large-scale synthesis or multistep synthesis because of the high price and recyclization difficulty of the gold. Read More

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http://pubs.acs.org/doi/10.1021/acs.accounts.8b00544
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http://dx.doi.org/10.1021/acs.accounts.8b00544DOI Listing
April 2019
1 Read

Enthalpies of Solution of C-Alkylresorcin[4]arenes in Water and Acetonitrile: Hydrophilic and Hydrophobic Effects.

J Phys Chem B 2019 Apr 19. Epub 2019 Apr 19.

Laboratorio de Termodinámica de Soluciones, Departamento de Química , Universidad de los Andes , Bogotá D.C. , Colombia.

Enthalpies of solution, Δ H, of six C-alkylresorcin[4]arene ( C-ARA) solids, with alkyl substituents varying systematically from methyl (Me) to hexyl (Hx), have been measured in water, using solubility data, and in acetonitrile, by direct calorimetry. For all of the C-ARAs studied, the values of Δ H were highly favorable (exothermic) for dissolution into water but were strongly unfavorable (endothermic) for dissolution into acetonitrile (ACN). The differences between the two solvents varied systematically with increasing carbon chain length, from about 100 kJ·mol (for Me) to 140 kJ·mol (for Hx). Read More

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http://dx.doi.org/10.1021/acs.jpcb.8b11330DOI Listing
April 2019
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Evaluating the impact of supercritical-CO pressure on the recovery and quality of oil from "horchata" by-products: Fatty acid profile, α-tocopherol, phenolic compounds, and lipid oxidation parameters.

Food Res Int 2019 Jun 27;120:888-894. Epub 2018 Nov 27.

Preventive Medicine and Public Health Department, Faculty of Pharmacy, Universitat de València, Avda. Vicent Andrés Estellés, s/n, 46100 Burjassot, Spain.

The effect of supercritical carbon dioxide (SC-CO) (10-40 MPa) and conventional extraction (CE) to recover oil from by-products obtained during "horchata" production was assessed. To evaluate both extraction techniques, the fatty acid composition, polyphenols, α-tocopherol, antioxidant capacity and lipid oxidation parameters of the extracts obtained were analysed. A linear relationship between extraction pressure and oil yield was observed. Read More

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http://dx.doi.org/10.1016/j.foodres.2018.11.054DOI Listing

Deep Eutectic Solvents as Efficient Solvents in Biocatalysis.

Trends Biotechnol 2019 Apr 16. Epub 2019 Apr 16.

DECHEMA Research Institute, Industrial Biotechnology, Theodor-Heuss-Allee 25, 60486 Frankfurt am Main, Germany. Electronic address:

'Ideal' solvents in biocatalysis have to fulfill a large number of requirements, such as high substrate solubility, high enzyme activity and stability, and positive effects on reaction equilibrium. In the past decades, many enzymatic synthesis routes in water-based and nonaqueous (organic solvents, ionic or supercritical fluids) reaction media have been developed. However, no solvent meets every demand for different reaction types at the same time, and there is still a need for novel solvents suited for different reaction types and applications. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S01677799193005
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http://dx.doi.org/10.1016/j.tibtech.2019.03.007DOI Listing
April 2019
1 Read

Enhanced lipase-catalyzed synthesis of sugar fatty acid esters using supersaturated sugar solution in ionic liquids.

Enzyme Microb Technol 2019 Jul 4;126:18-23. Epub 2019 Mar 4.

Department of Biological Engineering, Inha University, Incheon, 22212, Republic of Korea. Electronic address:

A solvent-mediated method (SMM) was used to prepare supersaturated sugar solutions in hydrophobic and mixture of hydrophilic/hydrophobic ionic liquids (ILs), namely, [Bmim][TfN] and [Bmim][TfO]/[Bmim][TfN], respectively. In this method, sugars were first solubilized in a mixture of organic solvent and water (i.e. Read More

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http://dx.doi.org/10.1016/j.enzmictec.2019.03.004DOI Listing

Fine-tuning of wettability in a single metal-organic framework postcoordination modification and its reduced graphene oxide aerogel for oil-water separation.

Chem Sci 2019 Mar 16;10(9):2663-2669. Epub 2019 Jan 16.

Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea . Email:

Elaborate control of wettability in a single platform is essential for materials' applications towards oil-water separation, but it still remains challenging. Herein, we performed postcoordination modification of Mg(dobpdc) with monoamines of various alkyl chain lengths, enabling both long-term hydrolytic stability and facile fine-tuning of wettability. An efficient separation of oil-water mixtures was achieved by using the octylamine-appended framework (OctA). Read More

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http://dx.doi.org/10.1039/c8sc04581jDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419944PMC

Highly Sensitive and Selective Nanogap-Enhanced SERS Sensing Platform.

Nanomaterials (Basel) 2019 Apr 16;9(4). Epub 2019 Apr 16.

Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon 51508, Korea.

This paper reports a highly sensitive and selective surface-enhanced Raman spectroscopy (SERS) sensing platform. We used a simple fabrication method to generate plasmonic hotspots through a direct maskless plasma etching of a polymer surface and the surface tension-driven assembly of high aspect ratio Ag/polymer nanopillars. These collapsed plasmonic nanopillars produced an enhanced near-field interaction via coupled localized surface plasmon resonance. Read More

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http://dx.doi.org/10.3390/nano9040619DOI Listing

Chiral acid-catalysed enantioselective C-H functionalization of toluene and its derivatives driven by visible light.

Nat Commun 2019 Apr 16;10(1):1774. Epub 2019 Apr 16.

Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, 475004, Kaifeng, Henan, China.

Toluene and its derivatives are petroleum-derived raw materials produced from gasoline by catalytic reformation. These abundant chemical feedstocks are commonly used as solvents in organic synthesis. The C(sp)-H functionalization of these unactivated substrates has been widely used to directly introduce benzylic motifs into diverse molecules to furnish important compounds. Read More

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http://dx.doi.org/10.1038/s41467-019-09857-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6467922PMC

Developing and Validating a UPLC-MS Method with a StageTip-Based Extraction for the Biogenic Amines Analysis in Fish.

J Food Sci 2019 Apr 16. Epub 2019 Apr 16.

School of Food Science and Technology, Dalian, Polytechnic Univ., National Engineering Research Center of Seafood, 1 Qinggongyuan, Ganjingzi District, Dalian, 116034, PR China.

To effectively extract biogenic amines (BAs) from complex food matrices is an important issue. In this study, a stop-and-go-extraction tip (StageTip)-based method for simultaneous enrichment of six BAs including histamine, tyramine, putrescine, cadaverine, tryptamine, and β-phenylethylamine in fish samples was developed and optimized. This StageTip-based BAs extraction method required short extraction time, small sample size, and minimal consumption of organic solvents. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1111/1750-3841.14
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http://dx.doi.org/10.1111/1750-3841.14597DOI Listing
April 2019
4 Reads
1.696 Impact Factor

Application of the Suzuki-Miyaura Reaction for the Postfunctionalization of the Benzo[4,5]thiazolo[3,2-c][1,3,5,2]oxadiazaborinine Core: An Approach towards Fluorescent Dyes.

J Org Chem 2019 Apr 16. Epub 2019 Apr 16.

Fluorescent dye based on 8-brominated benzo[4,5]thiazolo[3,2-c][1,3,5,2]oxadiazaborinine core was synthesized from benzo[d]thiazol-2-amine. The new boron complex can be effectively modified by palladium-catalyzed Suzuki-Miyaura cross-coupling reaction with (het)arylboronic acids. This reaction allows a valuable regioselective postfunctionalization of 1,3,5,2-oxadiazaborinine chromophores with different aromatic substituents. Read More

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http://pubs.acs.org/doi/10.1021/acs.joc.9b00566
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http://dx.doi.org/10.1021/acs.joc.9b00566DOI Listing
April 2019
1 Read

Peptide Oligomerization Memory Effects and Their Impact on the Physical Stability of the GLP-1 Agonist Liraglutide.

Mol Pharm 2019 Apr 16. Epub 2019 Apr 16.

Peptides and proteins commonly have complex structural landscapes allowing for transformation into a wide array of species including oligomers, aggregates, and fibrils. The formation of undesirable forms including aggregates and fibrils poses serious risks from the perspective of drug development and disease. Liraglutide, a GLP-1 agonist for the treatment of diabetes, is a conjugated peptide that forms oligomers that can be stabilized by pH and organic solvents. Read More

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http://dx.doi.org/10.1021/acs.molpharmaceut.9b00106DOI Listing

Bis-triethylene Glycolic Crown-5-calix[4]arene: A Promoter of Nucleophilic Fluorination Using Potassium Fluoride.

Org Lett 2019 Apr 16. Epub 2019 Apr 16.

Department of Chemistry and Chemical Engineering , Inha University , 100 Inha-ro , Nam-gu, Incheon 402-751 , Korea.

We designed and synthesized a bis-triethylene glycolic crown-5-calix[4]arene (BTC5A) as a multifunctional promoter for nucleophilic fluorination using KF. The synergetic effect of the calix-crown moiety and ethylene glycols of BTC5A enabled KF to be easily dissolved in organic solvents and activated the fluoride in even nonpolar aprotic media. To validate its practicality, the S2 fluorinations including F-fluorination of various substrates were successfully conducted using KF(or [F]F) in the presence of BTC5A. Read More

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http://dx.doi.org/10.1021/acs.orglett.9b00649DOI Listing

Covalently Linked Bis(Amido-Corroles): Inter- and Intramolecular Hydrogen Bond Driven Supramolecular Assembly.

Chemistry 2019 Apr 16. Epub 2019 Apr 16.

Institute of Organic Chemistry, Polish Academy of Sciences, Institute of Organic Chemistry, Kasprzaka 44/52, 01-224, Warsaw, POLAND.

Four bis-corroles linked via diamide bridges were synthesized via peptide-type coupling of a trans-A2B-corrole-acid with aliphatic and aromatic diamines. In the solid state, the hydrogen bond pattern in these bis-corroles is strongly affected by the type of solvent used in the crystallization process. Although intramolecular hydrogen bonds play a decisive role, they are supported by intermolecular hydrogen bonds and weak N-H∙∙∙π interactions between molecules of toluene and corrole cores. Read More

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http://dx.doi.org/10.1002/chem.201901254DOI Listing

Electrospray Film Deposition for Solvent-Elimination Infrared Spectroscopy.

Appl Spectrosc 2019 Apr 16:3702818821330. Epub 2019 Apr 16.

1 ENAC/IIE Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland.

The application of electrospray (ES) for quantitative transfer of analytes from solution to an internal reflection element for analysis by attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy has been developed in this work. The ES ATR FT-IR method is evaluated with non-volatile and semi-volatile organic and inorganic compounds dissolved in pure organic solvents or organics in a mixture with water. The technique demonstrates the capability for rapid solvent evaporation from dilute solutions, facilitating the creation of thin films that allow ATR FT-IR to generate transmission-mode-like spectra. Read More

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http://dx.doi.org/10.1177/0003702818821330DOI Listing
April 2019
1 Read

Photo-Triggered Reversible Phase Transfer of Azobenzene-Based Ionic Liquid Surfactants between Oil and Water.

Int J Mol Sci 2019 Apr 4;20(7). Epub 2019 Apr 4.

Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China.

The reversible phase transfer of compounds between two immiscible liquid phases has many applications in a wide range of fields, and ionic liquids have been widely used as potential functional solvents and catalysts. However, photo-triggered reversible phase transfer of ionic liquids between the organic phase and water phase has not been reported so far. In the present work, the reversible phase transfer of six kinds of azobenzene-based ionic liquid surfactants between the organic phase and water phase is investigated by alternative irradiation of UV and visible light. Read More

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http://dx.doi.org/10.3390/ijms20071685DOI Listing

Understanding the Significance of Biochemistry in the Storage, Handling, Purification, and Sampling of Amphiphilic Mycolactone.

Toxins (Basel) 2019 Apr 4;11(4). Epub 2019 Apr 4.

Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

Mycolactone, the amphiphilic macrolide toxin secreted by , plays a significant role in the pathology and manifestations of Buruli ulcer (BU). Consequently, it follows that the toxin is a suitable target for the development of diagnostics and therapeutics for this disease. Yet, several challenges have deterred such development. Read More

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http://dx.doi.org/10.3390/toxins11040202DOI Listing
April 2019
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Two solvent-induced variable host-guest two-dimensional binary frameworks mediated by hydrogen bonding.

Phys Chem Chem Phys 2019 Apr 15. Epub 2019 Apr 15.

Department of Science, Nanchang Institute of Technology, Nanchang 330099, P. R. China.

Two-dimensional binary hydrogen-bonded organic frameworks constructed from 1,3,5-benzenetricarboxylic acid (TMA) and 4,4'-biphenyldicarboxylic acid (BDA) on highly oriented pyrolytic graphite (HOPG) were investigated by scanning tunneling microscopy (STM) in heptanoic acid and octanoic acid solvents. High-resolution STM observations demonstrated that various assemblies of hydrogen-bonded networks are strongly dependent on the nature of the solvent. Well-ordered porous rectangular flowerlike networks were revealed at the heptanoic acid/HOPG interface, whereas two different coexisting densely packed guest-host BDA/TMA structures were observed at the octanoic acid/HOPG interface. Read More

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http://dx.doi.org/10.1039/c9cp01395dDOI Listing
April 2019
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Simple fabrication of layered halide perovskite platelets and enhanced photoluminescence from mechanically exfoliated flakes.

Nanoscale 2019 Apr 15. Epub 2019 Apr 15.

Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

Rapid progress on the fabrication of lead halide perovskite crystals has led to highly promising performance in optoelectronic devices, particularly from three-dimensional crystals. Recently, these efforts have been extended to layered perovskite structures, motivated in part by their good environmental stability. Furthermore, layered perovskites represent a nanocrystal system with micron-size extensions and strong confinement in one dimension that is highly appealing for studying fundamental photophysics. Read More

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http://dx.doi.org/10.1039/c9nr00638aDOI Listing

A new extremely halophilic, calcium-independent and surfactant-resistant alpha-amylase from sp. SL3.

J Microbiol Biotechnol 2019 Apr 12. Epub 2019 Apr 12.

College of Biological Science and Engineering, Fuzhou University, Fuzhou 350116, P. R. China.

A new α-amylase-encoding gene () of glycoside hydrolase (GH) family 13 was identified in soda lake isolate sp. SL3. The deduced AmySL3 shares high identities (82-98%) with putative α-amylases from the genus , but has low identities (<53%) with functionally characterized counterparts. Read More

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http://dx.doi.org/10.4014/jmb.1901.01038DOI Listing

Synthesis and response of pineapple peel carboxymethyl cellulose-g-poly (acrylic acid-co-acrylamide)/graphene oxide hydrogels.

Carbohydr Polym 2019 Jul 1;215:366-376. Epub 2019 Apr 1.

School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China. Electronic address:

Developing biomaterials derived from the renewable resources is an effective and sustainable approach to address environmental and resource issues. Herein, hydrogels were synthesized by grafting copolymerization of acrylic acid and acrylamide onto pineapple peel carboxymethyl cellulose with incorporation of graphene oxide (GO). The structure, swelling, and multiple responses to salt, pH and organic solvents were investigated. Read More

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http://dx.doi.org/10.1016/j.carbpol.2019.03.090DOI Listing

Acids 'generally recognized as safe' affect morphology and biocompatibility of electrospun chitosan/polyethylene oxide nanofibers.

Carbohydr Polym 2019 Jul 18;215:253-262. Epub 2019 Mar 18.

Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark. Electronic address:

Electrospinning of neat chitosan is currently achieved by using strong acids or organic solvents, which limits the use of chitosan nanofibers as biocompatible scaffolds for drug delivery and tissue engineering. The aim was to elucidate the effect of specific acids generally recognized as safe (GRAS) on the properties of electrospun chitosan-based nanofibers. Electrospinning chitosan in dilute acetic acid or succinic acid with polyethylene oxide resulted in white and separated nanofibers, whereas nanofibers electrospun in dilute citric acid were transparent and interconnected. Read More

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http://dx.doi.org/10.1016/j.carbpol.2019.03.061DOI Listing

Fluorescence enhancement novel green analytical method for paraquat herbicide quantification based on immobilization on clay.

Analyst 2019 Apr 12. Epub 2019 Apr 12.

INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, 8000 Bahía Blanca, Argentina.

A new green method was developed for the quantification of paraquat (PQ) in water samples based on the fluorescence emission enhancement of the herbicide signal after adsorption on sodium montmorillonite clay (MMT). Radiant emission processes are favored by increasing the molecular rigidity of the PQ since it adopts a planar position between the nano-sheets of the MMT. The advantages of the use of this clay are nontoxic, low cost and found in abundance in natural reserves. Read More

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http://dx.doi.org/10.1039/c9an00387hDOI Listing

Synthesis of Soluble Metal Organic Framework Composites for Mixed Matrix Membranes.

ACS Appl Mater Interfaces 2019 Apr 12. Epub 2019 Apr 12.

A general, green, efficient and easily scalable methodology has been developed to more effectively incorpo-rate (disperse) MOFs into polymer technologies via solid state synthesis of any MOF nanocrystals within sol-uble mesoporous polymers. The resulting solid hybrid materials (pellets) can be directly transformed into colloidal MOF polymeric suspensions (inks) by simple dissolution in organic solvents. The straightforward use of novel colloidal MOF polymeric inks as ultimate additive for mixed matrix membranes resulted in un-precedented snakeskin microstructure exhibiting outstanding selectivity for CO2 over N2 (>100) from post-combustion flue gas at very low and well-dispersed MOF nanocrystal concentrations ranging from 1 to 7 wt. Read More

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http://pubs.acs.org/doi/10.1021/acsami.9b02622
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http://dx.doi.org/10.1021/acsami.9b02622DOI Listing
April 2019
1 Read

Solvent Fractionation and Acetone Precipitation for Crude Saponins from Extract.

Molecules 2019 Apr 10;24(7). Epub 2019 Apr 10.

Metabolites Profiling Laboratory, Institute of Bioproduct Development, Universiti Teknologi Malaysia, Skudai, Johor Bahru 81310 UTM, Johor, Malaysia.

is a popular folk medicine in South East Asia. This study was focused on saccharide-containing compounds including saponins, mainly because of their medical potentials. Different organic solvents such as ethyl acetate, butanol, and chloroform were used to fractionate the phytochemical groups, which were consequently precipitated in cold acetone. Read More

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https://www.mdpi.com/1420-3049/24/7/1416
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http://dx.doi.org/10.3390/molecules24071416DOI Listing
April 2019
4 Reads

Synthetic Biodegradable Aliphatic Polyester Nanocomposites Reinforced with Nanohydroxyapatite and/or Graphene Oxide for Bone Tissue Engineering Applications.

Nanomaterials (Basel) 2019 Apr 10;9(4). Epub 2019 Apr 10.

Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.

This paper provides review updates on the current development of bionanocomposites with polymeric matrices consisting of synthetic biodegradable aliphatic polyesters reinforced with nanohydroxyaptite (nHA) and/or graphene oxide (GO) nanofillers for bone tissue engineering applications. Biodegradable aliphatic polyesters include poly(lactic acid) (PLA), polycaprolactone (PCL) and copolymers of PLA-PGA (PLGA). Those bionanocomposites have been explored for making 3D porous scaffolds for the repair of bone defects since nHA and GO enhance their bioactivity and biocompatibility by promoting biomineralization, bone cell adhesion, proliferation and differentiation, thus facilitating new bone tissue formation upon implantation. Read More

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http://dx.doi.org/10.3390/nano9040590DOI Listing

In situ synthesis, stabilization and activity of protein-modified gold nanoparticles for biological applications.

Biomater Sci 2019 Apr 10. Epub 2019 Apr 10.

Chemistry Department, Missouri State University, 901 S. National Ave, Springfield, Missouri 65897, USA.

Herein, we demonstrate the use of lysozyme (Lys) as a model to fabricate a protein carrier system based on gold nanoparticles (AuNPs) via the Layer-by-Layer (LbL) technology. Poly(ethyleneimine) (PEI) and poly(sodium 4-styrenesulfonate) (PSS) were used as cationic and anionic polymers respectively to grow oppositely charged layers. Mild aqueous conditions were utilized to avoid protein denaturation and activity instead of organic solvents that have been used in other encapsulation systems. Read More

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http://dx.doi.org/10.1039/c9bm00129hDOI Listing

Effect of Selected Thiols on Cross-Linking of Acrylated Epoxidized Soybean Oil and Properties of Resulting Polymers.

Polymers (Basel) 2018 Apr 14;10(4). Epub 2018 Apr 14.

Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu rd. 19, 50254 Kaunas, Lithuania.

The effect of the chemical structure and functionality of three structurally different thiols on the cross-linking of acrylated epoxidized soybean oil and on the properties of the resulting polymers was investigated in this study. 1,3-Benzenedithiol, pentaerythritol tetra(3-mercaptopropionate), and an hexathiol synthesized from squalene were used in the cross-linking of acrylated epoxidized soybean oil by thiol⁻Michael addition reaction. The reactivity of thiols determined from calorimetric curves followed the order: 1,3-benzenedithiol > pentaerythritol tetra(3-mercaptopropionate) > hexathiolated squalene. Read More

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http://dx.doi.org/10.3390/polym10040439DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415230PMC

Green Strategies for Molecularly Imprinted Polymer Development.

Polymers (Basel) 2018 Mar 12;10(3). Epub 2018 Mar 12.

LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.

Molecular imprinting is a powerful technology to create artificial receptors within polymeric matrices. Although it was reported for the first time by Polyakov, eighty-four years ago, it remains, nowadays, a very challenging research area. Molecularly imprinted polymers (MIPs) have been successfully used in several applications where selective binding is a requirement, such as immunoassays, affinity separation, sensors, and catalysis. Read More

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http://dx.doi.org/10.3390/polym10030306DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415187PMC

Polymer Grafted Aluminum Nanoparticles for Percolative Composite Films with Enhanced Compatibility.

Polymers (Basel) 2019 Apr 8;11(4). Epub 2019 Apr 8.

State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China.

Aluminum nanoparticles hold promise for highly energetic materials and sustainable surface plasmonic materials. Most of the commercial Al nanoparticles are prepared via a high-throughput electrical explosion of wires method (up to 200 g h). However, the use of Al nanoparticles produced by an electrical explosion of wires is limited by their micrometer-sized aggregations and poor stability. Read More

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http://dx.doi.org/10.3390/polym11040638DOI Listing
April 2019
1 Read

Photoinduced Proton Transfer of GFP-Inspired Fluorescent Superphotoacids: Principles and Design.

J Phys Chem B 2019 Apr 18. Epub 2019 Apr 18.

Department of Chemistry , Oregon State University , 153 Gilbert Hall , Corvallis , Oregon 97331 , United States.

Proton transfer remains one of the most fundamental processes in chemistry and biology. Superphotoacids provide an excellent platform to delineate the excited-state proton transfer (ESPT) mechanism on ultrafast time scales and enable one to precisely control photoacidity and other pertinent functionalities such as fluorescence. We modified the GFP core ( p-HBDI chromophore) into two series of highly fluorescent photoacids by fluorinating the phenolic ring and conformationally locking the backbone (i. Read More

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http://dx.doi.org/10.1021/acs.jpcb.9b03201DOI Listing
April 2019
2 Reads

Nanocrystals in Molten Salts and Ionic Liquids: Experimental Observation of Ionic Correlations Extending beyond the Debye Length.

ACS Nano 2019 Apr 16. Epub 2019 Apr 16.

Department of Chemistry and James Franck Institute , University of Chicago , Chicago , Illinois 60637 , United States.

The nature of the interface between the solute and the solvent in a colloidal solution has attracted attention for a long time. For example, the surface of colloidal nanocrystals (NCs) is specially designed to impart colloidal stability in a variety of polar and nonpolar solvents. This work focuses on a special type of colloids where the solvent is a molten inorganic salt or organic ionic liquid. Read More

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http://dx.doi.org/10.1021/acsnano.9b01292DOI Listing

Versatile and High-Throughput Polyelectrolyte Complex Membranes via Phase Inversion.

ACS Appl Mater Interfaces 2019 Apr 19. Epub 2019 Apr 19.

High-flux filtration membranes constructed through scalable and sustainable methods are desirable for energy-efficient separations. Often, these criteria are difficult to be reconciled with one another. Polymeric membranes can provide high flux but frequently involve organic solvents in processing steps. Read More

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http://pubs.acs.org/doi/10.1021/acsami.9b02115
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http://dx.doi.org/10.1021/acsami.9b02115DOI Listing
April 2019
2 Reads

Investigative evaluation of for antibacterial capacity and biomimetic synthesis of silver nanoparticles.

IET Nanobiotechnol 2018 Dec;12(8):1062-1066

Department of Biosciences, COMSATS University Islamabad, Tarlai Kalan, 45550 Islamabad, Pakistan.

is used for medicinal purposes for a long time all over the world. In this study, the authors report the antimicrobial potential of extracts obtained with different solvents. The extract(s) obtained with ethyl acetate yielded the best antibacterial effects because of a rich supply of oxalates and alkaloids in it. Read More

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http://dx.doi.org/10.1049/iet-nbt.2018.5054DOI Listing
December 2018
5 Reads

Experiment and simulation on kinetic resolution of (R,S)-2-chloromandelic acid by enzymatic transesterification.

Biotechnol Prog 2019 Apr 8:e2815. Epub 2019 Apr 8.

Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, China.

Optically pure 2-chloromandelic acid (ClMA) is a very important chiral drug intermediate for synthesis of (S)-clopidogrel, belonging to the platelet aggregation inhibitor. Enantioselective resolution of (R,S)-2-chloromandelic acid was carried out in organic solvent through irreversible transesterification catalyzed by lipase AK with vinyl acetate acting as the acyl donor. Effects of various conditions on enantioselectivity and activity of lipase were investigated, including organic solvents, temperature, water content, substrate ratio, enzyme loading, and reaction time. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/btpr.2815
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http://dx.doi.org/10.1002/btpr.2815DOI Listing
April 2019
11 Reads

Properties of Waterborne Polyurethane Conductive Coating with Low MWCNTs Content by Electrostatic Spraying.

Polymers (Basel) 2018 Dec 19;10(12). Epub 2018 Dec 19.

School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.

Because flammable organic solvents are emitted during the construction process, oil-based conductive coatings generally result in potential safety problems. A high content of conductive mediums can also weaken the adhesive and protective abilities of existing conductive coatings. Therefore, an anticorrosive and conductive coating was prepared on Q235 steel substrate by spraying the multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) dispersion with a low MWCNT content in this work. Read More

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http://dx.doi.org/10.3390/polym10121406DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401745PMC
December 2018

A Comparative Study of Dynamic Light and X-ray Scatterings on Micelles of Topological Polymer Amphiphiles.

Polymers (Basel) 2018 Dec 5;10(12). Epub 2018 Dec 5.

Department of Chemistry, Division of Advanced Materials Science, Polymer Research Institute, and Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea.

Micelles were prepared in organic solvents by using three topological polymer amphiphiles: (i) poly(-decyl glycidyl ether--2-(2-(2-methoxyethoxy)ethoxy)ethyl glycidyl ether) (-PDGE--PTEGGE) and (ii) its analogue (-PDGE--PTEGGE); (iii) poly(6-phosphorylcholinehexylthiopropyl glycidyl ether---dodecanoyl glycidyl ether) (-PPCGE--PDDGE). For the individual micelle solutions, the size and distribution were determined by dynamic light scattering (DLS) and synchrotron X-ray scattering analyses. The synchrotron X-ray scattering analysis further found that -PDGE--PTEGGE forms oblate ellipsoidal micelle in an ethanol/water mixture, -PDGE--PTEGGE makes prolate ellipsoidal micelle in an ethanol/water mixture, and -PPCGE--PDDGE forms cylindrical micelle in chloroform. Read More

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http://dx.doi.org/10.3390/polym10121347DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401847PMC
December 2018

Optimization and Validation of Efficient Models for Predicting Polythiophene Self-Assembly.

Polymers (Basel) 2018 Nov 26;10(12). Epub 2018 Nov 26.

Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83705, USA.

We develop an optimized force-field for poly(3-hexylthiophene) (P3HT) and demonstrate its utility for predicting thermodynamic self-assembly. In particular, we consider short oligomer chains, model electrostatics and solvent implicitly, and coarsely model solvent evaporation. We quantify the performance of our model to determine what the optimal system sizes are for exploring self-assembly at combinations of state variables. Read More

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http://dx.doi.org/10.3390/polym10121305DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401914PMC
November 2018

Synthesis, Characterization and Cytotoxicity of Novel Thermoresponsive Star Copolymers of ,'-Dimethylaminoethyl Methacrylate and Hydroxyl-Bearing Oligo(Ethylene Glycol) Methacrylate.

Polymers (Basel) 2018 Nov 12;10(11). Epub 2018 Nov 12.

Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, 41-819 Zabrze, Poland.

Novel, nontoxic star copolymers of ,-dimethylaminoethyl methacrylate (DMAEMA) and hydroxyl-bearing oligo(ethylene glycol) methacrylate (OEGMA-OH) were synthesized via atom transfer radical polymerization (ATRP) using hyperbranched poly(arylene oxindole) as the macroinitiator. Stars with molar masses from 100,000 g/mol to 257,000 g/mol and with various amounts of OEGMA-OH in the arms were prepared. As these polymers can find applications, e. Read More

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http://dx.doi.org/10.3390/polym10111255DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401879PMC
November 2018

Facile NiO Sol-Gel Synthesis Depending on Chain Length of Various Solvents without Catalyst for Efficient Hole Charge Transfer in Perovskite Solar Cells.

Polymers (Basel) 2018 Nov 6;10(11). Epub 2018 Nov 6.

School of Integrative Engineering, Chung-Ang University, 84 Heukseok-Ro, Dongjak-gu, Seoul 06974, Korea.

Nickel oxide (NiO)⁻based perovskite solar cells (PSCs) have recently gained considerable interest, and exhibit above 20% photovoltaic efficiency. However, the reported syntheses of NiO sol-gel used toxic chemicals for the catalysts during synthesis, which resulted in a high-temperature annealing requirement to remove the organic catalysts (ligands). Herein, we report a facile "NiO sol-gel depending on the chain length of various solvents" method that eschews toxic catalysts, to confirm the effect of different types of organic solvents on NiO synthesis. Read More

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http://dx.doi.org/10.3390/polym10111227DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6290588PMC
November 2018

A Combined XRD, Solvatochromic, and Cyclic Voltammetric Study of Poly (3,4-Ethylenedioxythiophene) Doped with Sulfonated Polyarylethersulfones: Towards New Conducting Polymers.

Polymers (Basel) 2018 Jul 13;10(7). Epub 2018 Jul 13.

Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy.

Despite the poor solubility in organic solvents, poly (3,4-ethylenedioxythiophene) (PEDOT) is one of the most successful conducting polymers. To improve PEDOT conductivity, the dopants commonly used are molecules/polymers carrying sulfonic functionalities. In addition to these species, sulfonated polyarylethersulfone (SPAES), obtained via homogeneous synthesis with different degrees of sulfonation (DS), can be used thanks to both the tight control over the DS and the charge separation present in SPAES structure. Read More

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http://dx.doi.org/10.3390/polym10070770DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403848PMC
July 2018
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Dapivirine Bioadhesive Vaginal Tablets Based on Natural Polymers for the Prevention of Sexual Transmission of HIV.

Polymers (Basel) 2019 Mar 13;11(3). Epub 2019 Mar 13.

Departamento de Farmacia Galénica y Tecnología Alimentaria, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain.

Young sub-Saharan women are a group that is vulnerable to the sexual transmission of HIV. Pre-exposure prophylaxis through vaginal microbicides could provide them an option for self-protection. Dapivirine has been demonstrated to have topical inhibitory effects in HIV, and to provide protection against the sexual transmission of this virus. Read More

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http://dx.doi.org/10.3390/polym11030483DOI Listing

New Triphenylamine-Based Oligomeric Schiff Bases Containing Tetraphenylsilane Moieties in the Backbone.

Polymers (Basel) 2019 Jan 27;11(2). Epub 2019 Jan 27.

Research Laboratory for Organic Polymers, Pontificia Universidad Católica de Chile, P.O. Box 306, Post 22, Santiago, Chile.

Three new triphenylamine-based oligomeric Schiff bases (polySB1, polySB2 and polySB3) containing tetraphenylsilane core (TPS-core) in the main chain were obtained from TPS-core-based diamines and bis(4-formylphenyl)phenylamine by a high-temperature polycondensation reaction. These new oligomers were structurally characterized by FT-IR, NMR and elemental analysis. All polySBs were highly soluble in common organic solvents, such as chloroform, tetrahydrofuran and chlorobenzene. Read More

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http://dx.doi.org/10.3390/polym11020216DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419043PMC
January 2019

Cold-Cured Epoxy-Based Organic⁻Inorganic Hybrid Resins Containing Deep Eutectic Solvents.

Polymers (Basel) 2018 Dec 22;11(1). Epub 2018 Dec 22.

Department of Engineering for Innovation, University of Salento, via per Monteroni, 73100 Lecce, Italy.

The development of improved cold-cured resins, to be used as either adhesives or matrices for FRP (fiber reinforced polymer) composites employed in the construction industry, has become the focus of several academic and industrial research projects. It is expected that the use of nano-structured organic⁻inorganic hybrid materials could represent a realistic alternative to commercial epoxy-based resins due to their superior properties, especially in terms of higher durability against: moisture, temperatures, harsh environments, and fire. In this context, organic⁻inorganic epoxy hybrids were synthesized by a modified sol⁻gel method without the addition of water. Read More

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http://www.mdpi.com/2073-4360/11/1/14
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http://dx.doi.org/10.3390/polym11010014DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401923PMC
December 2018
1 Read

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CC₁im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter.

Molecules 2019 Apr 5;24(7). Epub 2019 Apr 5.

Key Laboratory of Coal Cleaning Conversion and Chemical Engineering Process, Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China.

The physicochemical properties of four 1-alkyl-3-methylimidazolium bromide ([CC₁im]Br, n = 5, 6, 7, 8) ionic liquids (ILs) were investigated in this work by using inverse gas chromatography (IGC) from 303.15 K to 343.15 K. Read More

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http://dx.doi.org/10.3390/molecules24071346DOI Listing

Cryogenic soil coring reveals coexistence of aerobic and anaerobic vinyl chloride degrading bacteria in a chlorinated ethene contaminated aquifer.

Water Res 2019 Mar 28;157:281-291. Epub 2019 Mar 28.

Department of Civil and Environmental Engineering, 4105 Seamans Center, The University of Iowa, Iowa City, IA, 52242, USA. Electronic address:

Vinyl chloride (VC) is a common groundwater contaminant and known human carcinogen. Three major bacterial guilds are known to participate in VC biodegradation: aerobic etheneotrophs and methanotrophs, and anaerobic organohalide-respiring VC-dechlorinators. We investigated the spatial relationships between functional genes representing these three groups of bacteria (as determined by qPCR) with chlorinated ethene concentrations in a surficial aquifer at a contaminated site. Read More

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http://dx.doi.org/10.1016/j.watres.2019.03.059DOI Listing

Nanobubble Technologies Offer Opportunities To Improve Water Treatment.

Acc Chem Res 2019 Apr 8. Epub 2019 Apr 8.

Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, School of Sustainable Engineering and the Built Environment , Arizona State University , Tempe , Arizona 85287-5306 , United States.

Since first hypothesizing the existence of nanobubbles (NBs) in 1994, the empirical study of NB properties and commercialization of NB generators have rapidly evolved. NBs are stable spherical packages of gas within liquid and are operationally defined as having diameters less than 1000 nm, though they are typically in the range of 100 nm in one dimension. While theories still lack the ability to explain empirical evidence for formation of stable NBs in water, numerous NB applications have emerged in different fields, including water and wastewater purification where NBs offer the potential to replace or improve efficiency of current treatment processes. Read More

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http://dx.doi.org/10.1021/acs.accounts.8b00606DOI Listing
April 2019
3 Reads

Postmenopausal breast cancer and occupational exposure to chemicals.

Scand J Work Environ Health 2019 Apr 8. Epub 2019 Apr 8.

Institute of Environmental Medicine, Unit of Occupational medicine, Karolinska Institutet, Solnavägen 4, 113 65 Stockholm.

Objectives The aim of this study was to investigate if exposure to chemicals in the workplace was associated with an increased risk of postmenopausal breast cancer. Methods The study comprised women born 1923-1950 living in Malmö city, Sweden, 1991-1996, and enrolled for a prospective population cohort study. Occupational exposure to various chemicals was assessed from job-exposure matrices. Read More

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http://www.sjweh.fi/show_abstract.php?abstract_id=3822
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http://dx.doi.org/10.5271/sjweh.3822DOI Listing
April 2019
1 Read

Sustainable approach for lycopene extraction from tomato processing by-product using hydrophobic eutectic solvents.

J Food Sci Technol 2019 Mar 13;56(3):1649-1654. Epub 2019 Feb 13.

2Department of Process Engineering and Applied Science, Dalhousie University, PO Box 15000, Halifax, NS B3H 4R2 Canada.

Lycopene, a non-polar antioxidant compound with important effects on human health and wide commercial applications, was extracted from tomato processing wastes using innovative hydrophobic eutectic mixtures (HEMs) replacing traditional organic solvents. HEMs were prepared using DL-menthol as hydrogen-bond acceptor (HBA) and lactic acid as hydrogen-bond donor (HBD), and the ultrasound-assisted extraction (UAE) was optimized using a Box-Behnken design to evaluate extraction conditions: extraction temperature (°C), molar ratio of eutectic mixture (moles HBA: mol HBD), solvent to sample ratio (volume to mass, mL/g), and extraction time (min), with lycopene extraction yield (µg/g d.w. Read More

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http://dx.doi.org/10.1007/s13197-019-03618-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6423202PMC
March 2019
1 Read